Sorry for the OT but I have visited a PDvD member's workshop wherein the whole second floor was full of NOS tubes. My estimate around 3,000 pieces of tubes.
Nice thing is this Guru allows me to borrow the tubes to experience the different flavors.
For me a priceless experience. It is not about the technical nature but the sound quality and enjoyment.
master tony pwede ka nang mag tayo ng tube depo he he daming tubes... grabe!